First…welcome to the forum.
Not sure where you heard that about fish and lamb. In fact, many here feed fish based foods (me included) and also include fish oil capsules for dry winter skin. There is one member here (in Europe) that gives fish heads to her basenjis as special treat (and I'm thinking of doing that this summer for mine when they can have it outdoors).
All 4 of my basenjis LOVE, LOVE, LOVE fish - in fact, I think the fish based dry foods are their favourites (i.e. Orijen, Taste of the Wild, Barking at the Moon). When I have fresh fish in the house for dinner they always get some - shrimp, mackerel, salmon, tuna. Fish is a huge high value treat to my dogs.
I also know of plenty of basenjis that have lamb in their foods. I've used lamb lung as training treats - basically was like crack for one of my dogs - crazy crazy crazy love of it. :eek: But I have to be careful with the lamb as one of mine gets the poos from it.